/*
 * SPDX-License-Identifier: Apache-2.0
 *
 * The OpenSearch Contributors require contributions made to
 * this file be licensed under the Apache-2.0 license or a
 * compatible open source license.
 */

/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch licenses this file to you under
 * the Apache License, Version 2.0 (the "License"); you may
 * not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
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/*
 * Modifications Copyright OpenSearch Contributors. See
 * GitHub history for details.
 */

package org.opensearch.search.aggregations.pipeline;

import org.opensearch.common.xcontent.XContentBuilder;
import org.opensearch.common.xcontent.XContentFactory;
import org.opensearch.search.aggregations.AggregationBuilder;
import org.opensearch.search.aggregations.bucket.global.GlobalAggregationBuilder;
import org.opensearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.opensearch.search.aggregations.support.ValueType;

import java.util.HashSet;
import java.util.Set;

import static org.hamcrest.Matchers.equalTo;
import static org.hamcrest.Matchers.nullValue;

public class PercentilesBucketTests extends AbstractBucketMetricsTestCase<PercentilesBucketPipelineAggregationBuilder> {

    @Override
    protected PercentilesBucketPipelineAggregationBuilder doCreateTestAggregatorFactory(String name, String bucketsPath) {
        PercentilesBucketPipelineAggregationBuilder factory = new PercentilesBucketPipelineAggregationBuilder(name, bucketsPath);
        if (randomBoolean()) {
            int numPercents = randomIntBetween(1, 20);
            double[] percents = new double[numPercents];
            for (int i = 0; i < numPercents; i++) {
                percents[i] = randomDoubleBetween(0.0, 100.0, false);
            }
            factory.setPercents(percents);
        }
        return factory;
    }

    public void testPercentsFromMixedArray() throws Exception {
        XContentBuilder content = XContentFactory.jsonBuilder()
            .startObject()
            .startObject("name")
            .startObject("percentiles_bucket")
            .field("buckets_path", "test")
            .array("percents", 0, 20.0, 50, 75.99)
            .endObject()
            .endObject()
            .endObject();

        PercentilesBucketPipelineAggregationBuilder builder = (PercentilesBucketPipelineAggregationBuilder) parse(createParser(content));

        assertThat(builder.getPercents(), equalTo(new double[] { 0.0, 20.0, 50.0, 75.99 }));
    }

    public void testValidate() {
        AggregationBuilder singleBucketAgg = new GlobalAggregationBuilder("global");
        AggregationBuilder multiBucketAgg = new TermsAggregationBuilder("terms").userValueTypeHint(ValueType.STRING);
        final Set<AggregationBuilder> aggBuilders = new HashSet<>();
        aggBuilders.add(singleBucketAgg);
        aggBuilders.add(multiBucketAgg);

        // First try to point to a non-existent agg
        assertThat(
            validate(aggBuilders, new PercentilesBucketPipelineAggregationBuilder("name", "invalid_agg>metric")),
            equalTo(
                "Validation Failed: 1: "
                    + PipelineAggregator.Parser.BUCKETS_PATH.getPreferredName()
                    + " aggregation does not exist for aggregation [name]: invalid_agg>metric;"
            )
        );

        // Now try to point to a single bucket agg
        assertThat(
            validate(aggBuilders, new PercentilesBucketPipelineAggregationBuilder("name", "global>metric")),
            equalTo(
                "Validation Failed: 1: The first aggregation in "
                    + PipelineAggregator.Parser.BUCKETS_PATH.getPreferredName()
                    + " must be a multi-bucket aggregation for aggregation [name] found :"
                    + GlobalAggregationBuilder.class.getName()
                    + " for buckets path: global>metric;"
            )
        );

        // Now try to point to a valid multi-bucket agg
        assertThat(validate(aggBuilders, new PercentilesBucketPipelineAggregationBuilder("name", "terms>metric")), nullValue());
    }
}
